/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: mirac
 * Date: 2025-08-17
 * Time: 22:57
 */
public class TreeNode {
    char val;
    public TreeNode left;
    public TreeNode right;
    TreeNode() {}
    TreeNode(char val) { this.val = val; }
}
